According to this, "C4FM: Special command/cross mode private call DTMF code (by default it's *) is entered followed by DTMF code A, then the desired configuration profile number."
Either I'm doing this incorrectly or this command set doesn't work between the FTM-400xdr and the OpenSpot 3. If I'm reading it correctly, to switch between profile 3 and profile 4 the command should be *A4 (asterisk, then A, then 4). If I press those buttons by themselves all I does is select the UHF MHz values, to QSY the radio. If I do it with the PTT pressed (i.e. hearing the three tones), I believe these tones are transmitted and once again nothing happens. There has to be some way to switch profiles easily, on the fly, from the FTM-400 while mobile. It's can't be an impossible task, but after 2 years and endless frustration it appears to not be possible. If you have any additional guidance I'd be very grateful!